Cupcake girl you should look up the story on the mobile popcorn cart once used at Old City Park . . practically rebuilt it to 1500-lbs to meet "interpretation". This is not a new story in Big D. There was also an Airstream or Silver Streak used for years in Deep Ellum as a food concessionaire (early 90's). Reasonable concerns about fire are valid. Being protected from flying debris is something they cannot provide.
As to aerodynamics: low ground clearance (vital) and a radius that is 10% of the length on other edges is found to be valid for FE purposes. Winds pile on flat walls that aren't relieved by radiused edges. The upper portions -- and cross-section -- of an AS is excellent in this regard.
Volvo Trucks Magazine
Exterior shape and all metal framing are conducive to surviving 90 mph winds from any direction what with the shape provided. Wish we could say the same for power poles, directional signals, etc.
An F5 will eventually hit D/FW. But while being east of downtown Dallas is best (and slightly north), the concerns they have are valid. But grandfathered structures make it moot.
Sounds like time for a talk with your Council member.